Description

In some calls I'm getting a 500 error on invite message reponse without reason message.
Some times it works well and others the 500 error arises with the same code and situation.

Log Messages

Jan 11 13:48:47 kamailio-alone /usr/sbin/kamailio[21953]: DEBUG: <core> [parser/msg_parser.c:616]: parse_msg(): SIP Reply  (status):
Jan 11 13:48:47 kamailio-alone /usr/sbin/kamailio[21953]: DEBUG: <core> [parser/msg_parser.c:618]: parse_msg():  version: <SIP/2.0>
Jan 11 13:48:47 kamailio-alone /usr/sbin/kamailio[21953]: DEBUG: <core> [parser/msg_parser.c:620]: parse_msg():  status:  <500>
Jan 11 13:48:47 kamailio-alone /usr/sbin/kamailio[21953]: DEBUG: <core> [parser/msg_parser.c:622]: parse_msg():  reason:  <>

DEBUG: <core> [msg_translator.c:2246]: generate_res_buf_from_sip_res(): copied size: orig:130, new: 14, rest: 420 msg=#012SIP/2.0 500 #015#012Via: SIP/2.0/UDP 37.133.221.218:9773;rport=9773;received=37.133.221.218;branch=z9hG4bKPj8d748325-ecc1-40dd-9f19-0edbe38f46a0#015#012Record-Route: <sip:146.185.142.19:9773;lr>#015#012Call-ID: 36fa4c8e-2e61-4b24-a775-584b2616b889#015#012From: <sip:+34639446862@146.185.142.19>;tag=179c6cb5-593e-4442-8596-1f40def7b336#015#012To: <sip:+34696501510@146.185.142.19>;tag=206c2f8e-2b61-4c51-af6b-7332e1830952#015#012CSeq: 9763 INVITE#015#012Content-Length:  0

SIP Traffic

U 2018/01/11 13:55:40.134061 37.133.221.218:9773 -> 146.185.142.19:9773
INVITE sip:+34696501510@146.185.142.19:9773 SIP/2.0.
Via: SIP/2.0/UDP 37.133.221.218:9773;rport;branch=z9hG4bKPj042d70a5-e935-4129-90d2-29ba7679fdc3.
Max-Forwards: 70.
From: sip:+34639446862@146.185.142.19;tag=bc792be2-981c-45b9-9d59-cd46951d60cd.
To: sip:+34696501510@146.185.142.19.
Contact: <sip:+34639446862@37.133.221.218:9773;ob>.
Call-ID: 0cbfc14f-69bb-4390-887a-ed9f673c58bc.
CSeq: 25548 INVITE.
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS.
Supported: replaces, 100rel, timer, norefersub.
Session-Expires: 1800.
Min-SE: 90.
Content-Type: application/sdp.
Content-Length:   476.
.
v=0.
o=- 3724667739 3724667739 IN IP4 192.168.1.141.
s=pjmedia.
b=AS:84.
t=0 0.
a=X-nat:0.
m=audio 4000 RTP/AVP 98 97 99 104 3 0 8 9 96.
c=IN IP4 192.168.1.141.
b=TIAS:64000.
a=rtcp:4001 IN IP4 192.168.1.141.
a=sendrecv.
a=rtpmap:98 speex/16000.
a=rtpmap:97 speex/8000.
a=rtpmap:99 speex/32000.
a=rtpmap:104 iLBC/8000.
a=fmtp:104 mode=30.
a=rtpmap:3 GSM/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:96 telephone-event/8000.
a=fmtp:96 0-16.


U 2018/01/11 13:55:40.143355 146.185.142.19:9773 -> 37.133.221.218:9773
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP 37.133.221.218:9773;rport=9773;branch=z9hG4bKPj042d70a5-e935-4129-90d2-29ba7679fdc3;received=37.133.221.218.
From: sip:+34639446862@146.185.142.19;tag=bc792be2-981c-45b9-9d59-cd46951d60cd.
To: sip:+34696501510@146.185.142.19.
Call-ID: 0cbfc14f-69bb-4390-887a-ed9f673c58bc.
CSeq: 25548 INVITE.
Server: kamailio (4.3.4 (x86_64/linux)).
Content-Length: 0.
.


U 2018/01/11 13:55:40.144092 146.185.142.19:9773 -> 37.133.221.218:1353
INVITE sip:+34696501510@37.133.221.218:1353;ob SIP/2.0.
Record-Route: <sip:146.185.142.19:9773;lr>.
Via: SIP/2.0/UDP 146.185.142.19:9773;branch=z9hG4bK6df7.9f8cf260e72edcb1fae300fb37edaa58.0.
Via: SIP/2.0/UDP 37.133.221.218:9773;received=37.133.221.218;rport=9773;branch=z9hG4bKPj042d70a5-e935-4129-90d2-29ba7679fdc3.
Max-Forwards: 69.
From: sip:+34639446862@146.185.142.19;tag=bc792be2-981c-45b9-9d59-cd46951d60cd.
To: sip:+34696501510@146.185.142.19.
Contact: <sip:+34639446862@37.133.221.218:9773;ob>.
Call-ID: 0cbfc14f-69bb-4390-887a-ed9f673c58bc.
CSeq: 25548 INVITE.
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS.
Supported: replaces, 100rel, timer, norefersub.
Session-Expires: 1800.
Min-SE: 90.
Content-Type: application/sdp.
Content-Length:   476.
.
v=0.
o=- 3724667739 3724667739 IN IP4 192.168.1.141.
s=pjmedia.
b=AS:84.
t=0 0.
a=X-nat:0.
m=audio 4000 RTP/AVP 98 97 99 104 3 0 8 9 96.
c=IN IP4 192.168.1.141.
b=TIAS:64000.
a=rtcp:4001 IN IP4 192.168.1.141.
a=sendrecv.
a=rtpmap:98 speex/16000.
a=rtpmap:97 speex/8000.
a=rtpmap:99 speex/32000.
a=rtpmap:104 iLBC/8000.
a=fmtp:104 mode=30.
a=rtpmap:3 GSM/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:96 telephone-event/8000.
a=fmtp:96 0-16.


U 2018/01/11 13:55:40.459709 37.133.221.218:1353 -> 146.185.142.19:9773
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 146.185.142.19:9773;received=146.185.142.19;branch=z9hG4bK6df7.9f8cf260e72edcb1fae300fb37edaa58.0.
Via: SIP/2.0/UDP 37.133.221.218:9773;rport=9773;received=37.133.221.218;branch=z9hG4bKPj042d70a5-e935-4129-90d2-29ba7679fdc3.
Record-Route: <sip:146.185.142.19:9773;lr>.
Call-ID: 0cbfc14f-69bb-4390-887a-ed9f673c58bc.
From: <sip:+34639446862@146.185.142.19>;tag=bc792be2-981c-45b9-9d59-cd46951d60cd.
To: <sip:+34696501510@146.185.142.19>.
CSeq: 25548 INVITE.
Content-Length:  0.
.


U 2018/01/11 13:55:40.459844 37.133.221.218:1353 -> 146.185.142.19:9773
SIP/2.0 500 .
Via: SIP/2.0/UDP 146.185.142.19:9773;received=146.185.142.19;branch=z9hG4bK6df7.9f8cf260e72edcb1fae300fb37edaa58.0.
Via: SIP/2.0/UDP 37.133.221.218:9773;rport=9773;received=37.133.221.218;branch=z9hG4bKPj042d70a5-e935-4129-90d2-29ba7679fdc3.
Record-Route: <sip:146.185.142.19:9773;lr>.
Call-ID: 0cbfc14f-69bb-4390-887a-ed9f673c58bc.
From: <sip:+34639446862@146.185.142.19>;tag=bc792be2-981c-45b9-9d59-cd46951d60cd.
To: <sip:+34696501510@146.185.142.19>;tag=fe966b81-31e8-484a-9cce-625f31915529.
CSeq: 25548 INVITE.
Content-Length:  0.
.


U 2018/01/11 13:55:40.463028 146.185.142.19:9773 -> 37.133.221.218:1353
ACK sip:+34696501510@37.133.221.218:1353;ob SIP/2.0.
Via: SIP/2.0/UDP 146.185.142.19:9773;branch=z9hG4bK6df7.9f8cf260e72edcb1fae300fb37edaa58.0.
Max-Forwards: 69.
From: sip:+34639446862@146.185.142.19;tag=bc792be2-981c-45b9-9d59-cd46951d60cd.
To: <sip:+34696501510@146.185.142.19>;tag=fe966b81-31e8-484a-9cce-625f31915529.
Call-ID: 0cbfc14f-69bb-4390-887a-ed9f673c58bc.
CSeq: 25548 ACK.
Content-Length: 0.
.

Possible Solutions

Additional Information

version: kamailio 4.4.6 (x86_64/linux) becbde
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: becbde 
compiled on 08:18:45 Jul  3 2017 with gcc 5.4.0


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